Syllable final -t in early modern Japanese? There is an unsourced claim in the Wikipedia article on Early Modern Japanese that its phonology admitted syllable-final /t/. This seems unlikely, since to my knowledge all reconstructions going back to OJ posit the same gross syllable structure as the modern language. Does anyone know where this claim originated, and whether it's true?

I think it's fairly widely acknowledged that Middle Japanese introduced syllable-final /m/, /n/ and /t/ because of Chinese loanwords, and that first the /m/ and /n/ merged into /N/, later /t/ turned into /tu/.

I think you are right that syllable-final /t/ has never existed in _native_ Japanese vocabulary.